I joined Google's accessibility group in order to make a complaint as a result of this post, and I get emails of posts. Usually people complain about a problem and the staff deny that it's anything to do with them, or say "Here's how you can work around it."

The current conversation is about those audio captchas, and they're still denying that they ought to do anything, but the latest workaround suggested might actually be useful for some people. Extracts from the conversation:

suggestion: switch to Firefox and install the WebVisum plugin. It is a CAPTCHA killer. It will solve nearly all CAPTCHAs and place them on your clipboard for pasting into an edit field.
[which suggests to me that the captchas are now useless as spam prevention anyway]

Then people ask how to find WebVisum, and how to get an invitation.

Today's answer: did you try to request an invitation at http://www.webvisum.com/en/main/invitationrequest

That's about as far as it's got.